CD274 and glioblastoma: CAR T cell research for GBM is intense: ongoing CAR T cell clinical trials in GBM include EGFRvIII (NCT01454596, NCT02209376, NCT02844062, and NCT03283631), ephrin type-A receptor 2 (EphA2) (NCT02575261), HER2 (NCT02442297, NCT01109095, and NCT03389230), IL-13Rα2 (NCT02208362), and PD-L1 (NCT02937844).